Mitigating pulsed interference using frequency domain adaptive filtering

Abstract : Civil Aviation standardization bodies (ICAO, RTCA, EUROCAE) aim at standardizing GNSS (Global Navigation Satellite Systems) for aircraft navigation. For safety reasons, on-board receivers must guarantee integrity and accuracy performance within the specified environment. The corresponding requirements are stated in the SARPS and MOPS (Minimum Operational Performance Specification), published by the quoted standardization bodies. Future use of Galileo E5a (or GPS L5) band raises among others interference issues. Indeed, pre-existent RF systems emit in this band, thus interfering with the E5a/L5 signals. The main threat was identified as being DME/TACAN ground beacons. These systems disturb the operation of on-board GNSS receivers in a non bearable manner if no mitigation is implemented. Two interference mitigation techniques (IMT) are proposed to fight this threat, and their performances are studied in the following. First, a baseline technique called temporal blanker is used as a reference. Its performances had already been assessed in [Bastide, 2004] and were shown to be compatible with civil aviation requirements. The idea is to detect and remove pulsed interference by looking at the signal?s power. Taking into account that the input signal (in absence of interference) should be equivalent to a Gaussian noise, the user can assume with low false detection rate that if the incoming signal?s power is relatively high, it is corrupted by an interference. Then, an innovative technique called Frequency Domain Adaptive Filtering (FDAF) is investigated, and is expected to provide better performance than the baseline technique. The idea is to detect and remove pulsed interference in the frequency domain by looking at the amplitude of the signal?s Fourier transform because the frequency spectrum may be less distorted than the temporal signal. Nevertheless, the second technique is highly constrained by implementation issues, while the first one is not. Hence, its performance and the possible benefits brought by the technique will be presented as a function of the technique?s design.
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Communication dans un congrès
ION GNSS 2006, 19th International Technical Meeting of the Satellite Division of The Institute of Navigation, Sep 2006, Fort Worth, United States. pp 2251 - 2260, 2006, 〈http://www.ion.org/publications/abstract.cfm?articleID=6959〉
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Mathieu Raimondi, Olivier Julien, Christophe Macabiau, Frédéric Bastide. Mitigating pulsed interference using frequency domain adaptive filtering. ION GNSS 2006, 19th International Technical Meeting of the Satellite Division of The Institute of Navigation, Sep 2006, Fort Worth, United States. pp 2251 - 2260, 2006, 〈http://www.ion.org/publications/abstract.cfm?articleID=6959〉. 〈hal-01021790〉

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